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Biran D, Rotem O, Rosen R, Ron EZ. Coping with High Temperature: A Unique Regulation in A. tumefaciens. Curr Top Microbiol Immunol 2018; 418:185-194. [PMID: 30182196 DOI: 10.1007/82_2018_119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Elevation of temperature is a frequent and considerable stress for mesophilic bacteria. Therefore, several molecular mechanisms have evolved to cope with high temperature. We have been studying the response of Agrobacterium tumefaciens to temperature stress, focusing on two aspects: the heat-shock response and the temperature-dependent regulation of methionine biosynthesis. The results indicate that the molecular mechanisms involved in A. tumefaciens control of growth at high temperature are unique and we are still missing important information essential for understanding how these bacteria cope with temperature stress.
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Affiliation(s)
- Dvora Biran
- School of Molecular Cell Biology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, 69978, Tel Aviv, Israel
| | - Or Rotem
- School of Molecular Cell Biology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, 69978, Tel Aviv, Israel
| | - Ran Rosen
- School of Molecular Cell Biology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, 69978, Tel Aviv, Israel
| | - Eliora Z Ron
- School of Molecular Cell Biology and Biotechnology, Faculty of Life Sciences, Tel Aviv University, 69978, Tel Aviv, Israel.
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3
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Zhang Y, Yan D, Xia L, Zhao X, Osei-Adjei G, Xu S, Sheng X, Huang X. The malS-5′UTR regulates hisG, a key gene in the histidine biosynthetic pathway in Salmonella enterica serovar Typhi. Can J Microbiol 2017; 63:287-295. [DOI: 10.1139/cjm-2016-0490] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bacterial noncoding RNAs (ncRNA) regulate diverse cellular processes, including virulence and environmental fitness. The malS 5′ untranslated region (named malS-5′UTR) was identified as a regulatory ncRNA that increases the invasive capacity of Salmonella enterica serovar Typhi. An IntaRNA search suggested base pairing between malS-5′UTR and hisG mRNA, a key gene in the histidine biosynthetic pathway. Overexpression of malS-5′UTR markedly reduced bacterial growth in minimal medium without histidine. Overexpression of malS-5′UTR increased mRNA from his operon genes, independently of the bax gene, and decreased HisG protein in Salmonella Typhi. RNA structure analysis showed base pairing of the malS-5′UTR RNA with the hisG mRNA across the ribosome binding site. Thus, we propose that malS-5′UTR inhibited hisG translation, probably by base pairing to the Shine–Dalgarno sequence.
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Affiliation(s)
- Ying Zhang
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - Dongmei Yan
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - Lin Xia
- Department of Clinical Laboratory, Affiliated hospital, Jiangsu University, Zhenjiang, Jiangsu 212001, People’s Republic of China
| | - Xin Zhao
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - George Osei-Adjei
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - Shungao Xu
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - Xiumei Sheng
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
| | - Xinxiang Huang
- Department of Biochemistry and Molecular Biology, Jiangsu University School of Medicine, Zhenjiang, Jiangsu 212013, People’s Republic of China
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4
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Zhang H, Jia Y, Xie X, Wang M, Zheng Y, Xu S, Zhang W, Wang Q, Huang X, Du H. RpoE promotes invasion and intracellular survival by regulating SPI-1 and SPI-2 in Salmonella enterica serovar Typhi. Future Microbiol 2016; 11:1011-24. [PMID: 27492279 DOI: 10.2217/fmb.16.19] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
AIM To demonstrate the role of RpoE during the later stage of hyperosmotic stress in Salmonella. MATERIALS & METHODS Expressions of SPI-1 and SPI-2 under hyperosmotic stress for 120 min were investigated by a microarray, and the invasion and intracellular survival of wild-type and ΔrpoE strains were compared. The global differential expression of bacterial proteins between the wild-type and ΔrpoE strains was examined after 120 min of hyperosmotic stress. RESULTS SPI-1 and SPI-2 were repressed, and the invasion and intracellular survival were defected in the ΔrpoE strain. Thirteen bacterial-associated proteins and 11 secreted proteins differed significantly between the wild-type and ΔrpoE strains. CONCLUSION RpoE may promote invasion and intracellular survival by regulating the expression of SPI-1 and SPI-2.
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Affiliation(s)
- Haifang Zhang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Yanwei Jia
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Xiaofang Xie
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Min Wang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Yi Zheng
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Shungao Xu
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Wei Zhang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Qiang Wang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Xinxiang Huang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
| | - Hong Du
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, PR China.,School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, PR China.,College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.,State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu 210093, PR China
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5
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Burcham ZM, Hood JA, Pechal JL, Krausz KL, Bose JL, Schmidt CJ, Benbow ME, Jordan HR. Fluorescently labeled bacteria provide insight on post-mortem microbial transmigration. Forensic Sci Int 2016; 264:63-9. [PMID: 27032615 DOI: 10.1016/j.forsciint.2016.03.019] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 02/24/2016] [Accepted: 03/10/2016] [Indexed: 01/08/2023]
Abstract
Microbially mediated mechanisms of human decomposition begin immediately after death, and are a driving force for the conversion of a once living organism to a resource of energy and nutrients. Little is known about post-mortem microbiology in cadavers, particularly the community structure of microflora residing within the cadaver and the dynamics of these communities during decomposition. Recent work suggests these bacterial communities undergo taxa turnover and shifts in community composition throughout the post-mortem interval. In this paper we describe how the microbiome of a living host changes and transmigrates within the body after death thus linking the microbiome of a living individual to post-mortem microbiome changes. These differences in the human post-mortem from the ante-mortem microbiome have demonstrated promise as evidence in death investigations. We investigated the post-mortem structure and function dynamics of Staphylococcus aureus and Clostridium perfringens after intranasal inoculation in the animal model Mus musculus L. (mouse) to identify how transmigration of bacterial species can potentially aid in post-mortem interval estimations. S. aureus was tracked using in vivo and in vitro imaging to determine colonization routes associated with different physiological events of host decomposition, while C. perfringens was tracked using culture-based techniques. Samples were collected at discrete time intervals associated with various physiological events and host decomposition beginning at 1h and ending at 60 days post-mortem. Results suggest that S. aureus reaches its highest concentration at 5-7 days post-mortem then begins to rapidly decrease and is undetectable by culture on day 30. The ability to track these organisms as they move in to once considered sterile space may be useful for sampling during autopsy to aid in determining post-mortem interval range estimations, cause of death, and origins associated with the geographic location of human remains during death investigations.
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Affiliation(s)
- Z M Burcham
- Department of Biological Sciences, Mississippi State University, Starkville, MS, USA.
| | - J A Hood
- Department of Biological Sciences, Mississippi State University, Starkville, MS, USA.
| | - J L Pechal
- Department of Entomology, Michigan State University, East Lansing, MI, USA.
| | - K L Krausz
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, USA.
| | - J L Bose
- Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City, KS, USA.
| | - C J Schmidt
- Department of Pathology, University of Michigan, MI, USA.
| | - M E Benbow
- Department of Entomology, Michigan State University, East Lansing, MI, USA; Department of Osteopathic Medical Specialties, Michigan State University, East Lansing, MI, USA.
| | - H R Jordan
- Department of Biological Sciences, Mississippi State University, Starkville, MS, USA.
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6
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Jain S, Graham C, Graham RLJ, McMullan G, Ternan NG. Quantitative proteomic analysis of the heat stress response in Clostridium difficile strain 630. J Proteome Res 2011; 10:3880-90. [PMID: 21786815 DOI: 10.1021/pr200327t] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Clostridium difficile is a serious nosocomial pathogen whose prevalence worldwide is increasing. Postgenomic technologies can now be deployed to develop understanding of the evolution and diversity of this important human pathogen, yet little is known about the adaptive ability of C. difficile. We used iTRAQ labeling and 2D-LC-MS/MS driven proteomics to investigate the response of C. difficile 630 to a mild, but clinically relevant, heat stress. A statistically validated list of 447 proteins to which functional roles were assigned was generated, allowing reconstruction of central metabolic pathways including glycolysis, γ-aminobutyrate metabolism, and peptidoglycan biosynthesis. Some 49 proteins were significantly modulated under heat stress: classical heat shock proteins including GroEL, GroES, DnaK, Clp proteases, and HtpG were up-regulated in addition to several stress inducible rubrerythrins and proteins associated with protein modification, such as prolyl isomerases and proline racemase. The flagellar filament protein, FliC, was down-regulated, possibly as an energy conservation measure, as was the SecA1 preprotein translocase. The up-regulation of hydrogenases and various oxidoreductases suggests that electron flux across these pools of enzymes changes under heat stress. This work represents the first comparative proteomic analysis of the heat stress response in C. difficile strain 630, complementing the existing proteomics data sets and the single microarray comparative analysis of stress response. Thus we have a benchmark proteome for this pathogen, leading to a deeper understanding of its physiology and metabolism informed by the unique functional and adaptive processes used during a temperature upshift mimicking host pyrexia.
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Affiliation(s)
- Shailesh Jain
- School of Biomedical Sciences, University of Ulster, Cromore Road, Coleraine, Co Londonderry, North Ireland, United Kingdom
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